Sounds like a install or setup problem to me. You want a answer to a problem that could have many causes. Don't bash us for not having a single answer for you. This furnace needs to be diagnosed by a tech with experience sitting in front of it.

I have seen it posted on many sites going back two years. But no real answers. end quote.

You hooked up with a small number of people who might have had the same problem you describe. Unless it's in the hundreds or thousands you do not have a basis for calling it "a common problem". There would be a letter from the factory to Rheem dealers if the problem you describe is wide spread.